What I'm trying to do:
Extend generated entities (RIA) on Silverlight (4.0) side to make multiple entities with common features share the same interface (A control needs to use multiple objects the same way. These objects are pretty much the same).

Hi Austin, Nice to meet you again :) And are there plans to fix the framework in SL 5.0?
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Vyas BharghavaMar 5 '11 at 4:35

I can't comment on Silverlight 5 features except what has been discussed at the Silverlight Firestarter, which was more high-level features (such as 64-bit, hardware decoded video, etc.).
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Austin LambMar 5 '11 at 4:37

Well, an elegant solution gone a-wasted ;) I figure I need to go 'dynamic' all the way on this one. (Return 'dynamic' and use it only in XAML. If needed in ViewModel, grit your teeth and typecast). Posting so could help someone. Thanks for your answer.
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Vyas BharghavaMar 5 '11 at 4:42

Just curious: Was there a technical reason for not the SL 4.0 BCLs not carrying the markers?
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Vyas BharghavaMar 5 '11 at 4:51

@Vyas: None that anybody outside Microsoft should have to know about. Our internal processes for building the framework have some...quirks, let's say, that make this harder than one might think.
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Austin LambMar 5 '11 at 5:40